// 头部
.header{
    width: 100%;
    position: fixed;
    left:0;
    top:0;
    z-index:10;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: #fff;
    background: black;
    padding:3%;
    font-size: 1.5em;
    .menu{
        width: 30%;
    }
    .logo{
        width: 60%;
        text-align: center;
        font-weight: bold;
    }
    .box{
        width: 30%;
        display: flex;
        justify-content: space-around;
    }
}

body{
    background: #c9c9c9;
}

//尾部
.guanyu{
    text-align: center;
    padding: 3% 0%;
    h3{
        font-size: .2em;
    }
    span{
        margin-left: 5%;
    }
}